explain in relation to osm terminology "nodes" and "ways"

explain very briefly the relationship "points" and "lines" with osm terminology "nodes" and "ways". This clears up confusion which may happen later when mappers try to understand OSM data or tag documentation. Plus existing OSM mappers migrating to iD get confused by this. One specific comment was that searching for the word "node" turns up nothing. ...on the other hand maybe this over-complicates a bit :-/